On 16 February, 2011 - Richard Elling sent me these 1,3K bytes: > On Feb 16, 2011, at 6:05 AM, Eff Norwood wrote: > > > I'm preparing to replicate about 200TB of data between two data centers > > using zfs send. We have ten 10TB zpools that are further broken down into > > zvols of various sizes in each data center. One DC is primary and the other > > will be the replication target and there is plenty of bandwidth between > > them (10 gig dark fiber). > > > > Are there any gotchas that I should be aware of? Also, at what level should > > I be taking the snapshot to do the zfs send? At the primary pool level or > > at the zvol level? Since the targets are to be exact replicas, I presume at > > the primary pool level (e.g. "tank") rather than for every zvol (e.g. > > tank/prod/vol1)? > > There is no such thing as a pool snapshot. There are only dataset snapshots.
.. but you can make a single recursive snapshot call that affects all datasets. > The trick to a successful snapshot+send strategy at this size is to start > snapping > early and often. You don't want to send 200TB, you want to send 2TB, 100 > times :-) > > The performance is tends to be bursty, so the fixed record size of the zvols > can > work to your advantage for capacity planning. Also, a buffer of some sort can > help > smooth out the utilization, see the threads on ZFS and mbuffer. > -- richard > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss /Tomas -- Tomas Ögren, st...@acc.umu.se, http://www.acc.umu.se/~stric/ |- Student at Computing Science, University of Umeå `- Sysadmin at {cs,acc}.umu.se _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
